【Android】TextView動态設定android:drawableLeft|Right|Top|Bottom,SetColor

Android中有時需動态設定控件四周的drawble圖檔，這個時候就需要調用 setCompoundDrawables(left, top, right, bottom)，四個參數類型都是drawable   Button繼承TextView，是以可以采用相同的設定方法   方法一.XML方式  

<TextView
        android:id="@+id/bookTitle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:drawableLeft="@drawable/checkmark"
        android:drawableRight="@drawable/checkmark"
        android:drawableTop="@drawable/checkmark"
        android:gravity="center_vertical"
        android:textStyle="bold"
        android:textSize="20dip"
        android:maxLines="1"
        android:ellipsize="end"/>      

  方法二.JAVA代碼  

Drawable img_on, img_off;
Resources res = getResources();
img_off = res.getDrawable(R.drawable.btn_strip_mark_off);
//調用setCompoundDrawables時，必須調用Drawable.setBounds()方法,否則圖檔不顯示
img_off.setBounds(0, 0, img_off.getMinimumWidth(), img_off.getMinimumHeight());
btn.setCompoundDrawables(img_off, null, null, null); //設定左圖示      

android 如何設定背景的透明度

半透明<Button android:background="#e0000000" ... />
透明<Button android:background="#00000000" ... />      

顔色和不透明度 (alpha) 值以十六進制表示法表示。任何一種顔色的值範圍都是 0 到 255（00 到 ff）。對于 alpha，00 表示完全透明，ff 表示完全不透明。表達式順序是“aabbggrr”，其中aa=alpha（00 到 ff）；bb=blue（00 到 ff）；gg=green（00 到 ff)；rr=red（00 到 ff）。例如，如果您希望對某疊加層應用不透明度為 50% 的藍色，則應指定以下值：7fff0000

Java代碼 

View v = findViewById(R.id.content);//找到你要設透明背景的layout 的id 
v.getBackground().setAlpha(100);//0~255透明度值 ，0為完全透明，255為不透明      

package com.txlong;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.TextView;

public class ListViewDemoActivity extends Activity {
    // private ListView listView;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        TextView tv = new TextView(this);
        tv.setText("Test set TextView's color.");
        //方案一：通過ARGB值的方式
        /**
         * set the TextView color as the 0~255's ARGB，These component values
         * should be [0..255], but there is no range check performed, so if they
         * are out of range, the returned color is undefined
         */
        //        tv.setTextColor(Color.rgb(255, 255, 255));
        /**
         * set the TextView color as the #RRGGBB #AARRGGBB 'red', 'blue',
         * 'green', 'black', 'white', 'gray', 'cyan', 'magenta', 'yellow',
         * 'lightgray', 'darkgray'
         */
        tv.setTextColor(Color.parseColor("#FFFFFF"));

        /** 原來不知道有上邊的方法，就用這個笨笨方法了 */
        //        String StrColor = null;
        //        StrColor = "FFFFFFFF";
        //        int length = StrColor.length();
        //        if (length == 6) {
        //            tv.setTextColor(Color.rgb(
        //                    Integer.valueOf(StrColor.substring(0, 2), 16),
        //                    Integer.valueOf(StrColor.substring(2, 4), 16),
        //                    Integer.valueOf(StrColor.substring(4, 6), 16)));
        //        } else if (length == 8) {
        //            tv.setTextColor(Color.argb(
        //                    Integer.valueOf(StrColor.substring(0, 2), 16),
        //                    Integer.valueOf(StrColor.substring(2, 4), 16),
        //                    Integer.valueOf(StrColor.substring(4, 6), 16),
        //                    Integer.valueOf(StrColor.substring(6, 8), 16)));
        //        }

        //方案二：通過資源引用
        //        tv.setTextColor(getResources().getColor(R.color.my_color));

        //方案三：通過資源檔案寫在String.xml中
        //        Resources resource = (Resources) getBaseContext().getResources();
        //        ColorStateList csl = (ColorStateList) resource.getColorStateList(R.color.my_color);
        //        if (csl != null) {
        //            tv.setTextColor(csl);
        //        }

        //方案四：通過xml檔案，如/res/text_color.xml
        //        XmlPullParser xrp = getResources().getXml(R.color.text_color);
        //        try {
        //            ColorStateList csl = ColorStateList.createFromXml(getResources(), xrp);
        //            tv.setTextColor(csl);
        //        } catch (Exception e) {
        //        }

        // listView = new ListView(this);
        //
        // Cursor cursor = getContentResolver().query(
        // Uri.parse("content://contacts/people"), null, null, null, null);
        //
        // startManagingCursor(cursor);
        //
        // ListAdapter listAdapter = new SimpleCursorAdapter(this,
        // android.R.layout.simple_expandable_list_item_2, cursor,
        // new String[] { "name", "name" }, new int[] {
        // android.R.id.text1, android.R.id.text2 });
        //
        // listView.setAdapter(listAdapter);
        // setContentView(listView);
        setContentView(tv);
    }
}　　      

String.xml檔案為：

<?xml version="1.0" encoding="utf-8"?>  
<resources>  
  
    <string name="hello">Hello World, ListViewDemoActivity!</string>  
    <string name="app_name">ListViewDemo</string>  
  
    <color name="my_color">#FFFFFF</color>  
  
</resources>        

/res/color/text_color.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="true" android:color="#FF111111"/>
    <!-- pressed -->
    <item android:state_focused="true" android:color="#FF222222"/>
    <!-- focused -->
    <item android:state_selected="true" android:color="#FF333333"/>
    <!-- selected -->
    <item android:state_active="true" android:color="#FF444444"/>
    <!-- active -->
    <item android:state_checkable="true" android:color="#FF555555"/>
    <!-- checkable -->
    <item android:state_checked="true" android:color="#FF666666"/>
    <!-- checked -->
    <item android:state_enabled="true" android:color="#FF777777"/>
    <!-- enabled -->
    <item android:state_window_focused="true" android:color="#FF888888"/>
    <!-- window_focused -->

</selector>      

轉載于:https://www.cnblogs.com/niray/p/3774506.html